How to find users who have access via ftp, ssh?

Question

linux

1.how to find users who have access via ftp, ssh?
2.how to determine the date of their last entry?
3.Is it possible to determine their recent activities in a specific folder?

Answer 1

1. View the contents of /etc/passwd (about ftp - you need to look separately)
2. View the logs or see the last output
3. View the user's history

Answer 2

1. View the corresponding configs
2. For ftp - view the log, for ssh - last
3. For ftp - view the log, for ssh - view .history, as well as the history of mc commands (if any)